The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2012
Filed:
Jun. 18, 2008
Hideyuki Miyagawa, Osaka, JP;
Yuki Shimizu, Daito, JP;
Mikio Inoue, Tokyo, JP;
Kabushiki Kaisha Fujikin, Osaka, JP;
Abstract
A water hammerless valve includes a pneumatically-operated valve having a valve disc for opening and closing a fluid channel by moving upward and downward through a pneumatic actuator operation, and a limiting mechanism for interfering with upward movement of the valve disc when the water hammer occurs. The limiting mechanism includes a stepping motor including a rotation shaft fixed on the upper actuator; a vertical movement component connected to the rotation shaft for moving upward and downward via rotation of the rotation shaft; a lower detecting component for detecting the fact that the vertical movement component contacts the upper end of a stem when the lower detecting component moves downward; and a control device for rotating the stepping motor, for controlling the air supply, and for transmitting a stop signal to the stepping motor when the lower end of the lower detecting component detects the fact.